<template>
  <div class="container">
    <div class="left-board">
      <div class="logo-wrapper">
        <div class="logo">
          <!-- <img :src="logo" alt="logo"> Form Generator
          <a class="github" href="https://github.com/JakHuang/form-generator" target="_blank">
            <img src="https://github.githubassets.com/pinned-octocat.svg" alt>
          </a> -->
        </div>
      </div>
      <el-scrollbar class="left-scrollbar">
        <div class="components-list">
          <div v-for="(item, listIndex) in leftComponents" :key="listIndex">
            <div class="components-title">
              <svg-icon icon-class="component" />
              {{ item.title }}
            </div>
            <draggable class="components-draggable" :list="item.list"
              :group="{ name: 'componentsGroup', pull: 'clone', put: false }" :clone="cloneComponent"
              draggable=".components-item" :sort="false" @end="onEnd">
              <div v-for="(element, index) in item.list" :key="index" class="components-item"
                @click="addComponent(element)">
                <div class="components-body">
                  <svg-icon :icon-class="element.__config__.tagIcon" />
                  {{ element.__config__.label }}
                </div>
              </div>
            </draggable>
          </div>
        </div>
      </el-scrollbar>
    </div>

    <div class="center-board">
      <div class="action-bar">
        <el-button icon="el-icon-video-play" type="text" @click="run">
          运行
        </el-button>
        <el-button icon="el-icon-view" type="text" @click="showJson">
          查看json
        </el-button>
        <el-button icon="el-icon-document-add" type="text" @click="saveJson">
          保存数据
        </el-button>
        <el-button class="copy-btn-main" icon="el-icon-document-copy" type="text" @click="copy">
          复制代码
        </el-button>
        <el-button icon="el-icon-download" type="text" @click="download">
          导出vue文件
        </el-button>
        <el-button class="delete-btn" icon="el-icon-delete" type="text" @click="empty">
          清空
        </el-button>
      </div>

      <el-scrollbar class="center-scrollbar">
        <el-row class="center-board-row" :gutter="formConf.gutter">
          <el-form :size="formConf.size" :label-position="formConf.labelPosition" :disabled="formConf.disabled == 1"
            :label-width="formConf.labelWidth + 'px'">
            <draggable class="drawing-board" :list="drawingList" :animation="340" group="groupName">
              <draggable-item v-for="(item, index) in drawingList" :key="item.__config__.renderKey"
                :drawing-list="drawingList" :current-item="item" :index="index" :active-id="activeId"
                :form-conf="formConf" @activeItem="activeFormItem" @copyItem="drawingItemCopy"
                @deleteItem="drawingItemDelete" />
            </draggable>

            <div v-show="!drawingList.length" class="empty-info">
              从左侧拖入或点选组件进行表单设计
            </div>
          </el-form>
        </el-row>
      </el-scrollbar>
    </div>

    <right-panel :active-data="activeData" :form-conf="formConf" :show-field="!!drawingList.length"
      @tag-change="tagChange" @fetch-data="fetchData" />

    <form-drawer :visible.sync="drawerVisible" :form-data="formData" size="100%" :generate-conf="generateConf" />
    <json-drawer size="60%" :visible.sync="jsonDrawerVisible" :json-str="JSON.stringify(formData)"
      @refresh="refreshJson" />
    <code-type-dialog :visible.sync="dialogVisible" title="选择生成类型" :show-file-name="showFileName" @confirm="generate" />
    <input id="copyNode" type="hidden">

    <!-- copy表单时必须修改的内容 -->
    <el-dialog title="新的表单信息" :visible.sync="dialogFormCopyVisible">
      <el-form :model="formConf" :rules="dialogFormCopyRules" label-width="150px">
        <el-form-item label="表单别名" prop="name">
          <el-input v-model="formConf.name" />
        </el-form-item>
        <el-form-item label="表单属性名" prop="formRef">
          <el-input v-model="formConf.formRef" />
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogFormCopyVisible = false">
          取消
        </el-button>
        <el-button type="primary" @click="saveJson">
          确定
        </el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
  import draggable from 'vuedraggable'
  import {
    debounce
  } from 'throttle-debounce'
  import {
    saveAs
  } from 'file-saver'
  import ClipboardJS from 'clipboard'
  import render from '@/components/render/render'
  import FormDrawer from './FormDrawer'
  import JsonDrawer from './JsonDrawer'
  import RightPanel from './RightPanel'
  import {
    inputComponents,
    selectComponents,
    layoutComponents,
    formConf
  } from '@/components/generator/config'
  import {
    exportDefault,
    beautifierConf,
    isNumberStr,
    titleCase,
    deepClone,
    drawingListGroup
  } from '@/utils/index'
  import {
    makeUpHtml,
    vueTemplate,
    vueScript,
    cssStyle
  } from '@/components/generator/html'
  import {
    makeUpJs
  } from '@/components/generator/js'
  import {
    makeUpCss
  } from '@/components/generator/css'
  import drawingDefalut from '@/components/generator/drawingDefalut'
  import logo from '@/assets/logo.png'
  import CodeTypeDialog from './CodeTypeDialog'
  import DraggableItem from './DraggableItem'
  import {
    getDrawingList,
    saveDrawingList,
    getIdGlobal,
    saveIdGlobal,
    getFormConf,
    saveFormConfToDB,
    cleareFormConf,
    clearDrawingList,
    getFormConfToDB,
    updateFormConfToDB
  } from '@/utils/db'
  // import loadBeautifier from '@/utils/loadBeautifier'

  let beautifier
  const emptyActiveData = {
    style: {},
    autosize: {}
  }
  let oldActiveId
  let tempActiveData
  const drawingListInDB = getDrawingList()
  const formConfInDB = getFormConf()
  const idGlobal = getIdGlobal()

  export default {
    components: {
      draggable,
      render,
      FormDrawer,
      JsonDrawer,
      RightPanel,
      CodeTypeDialog,
      DraggableItem
    },
    data() {
      return {
        logo,
        idGlobal,
        formConf,
        inputComponents,
        selectComponents,
        layoutComponents,
        labelWidth: 100,
        drawingList: drawingDefalut,
        drawingData: {},
        activeId: drawingDefalut[0].formId,
        drawerVisible: false,
        formData: {},
        dialogVisible: false,
        dialogFormCopyVisible: false,
        jsonDrawerVisible: false,
        generateConf: null,
        showFileName: false,
        activeData: drawingDefalut[0],
        saveDrawingListDebounce: debounce(340, saveDrawingList),
        saveIdGlobalDebounce: debounce(340, saveIdGlobal),
        saveFormConfToDBDebounce: debounce(340, saveFormConfToDB),
        cleareFormConfDebounce: debounce(340, cleareFormConf),
        clearDrawingListDebounce: debounce(340, clearDrawingList),
        getFormConfToDBDebounce: debounce(340, getFormConfToDB),
        updateFormConfToDBDebounce: debounce(340, updateFormConfToDB),
        leftComponents: [{
            title: '输入型组件',
            list: inputComponents
          },
          {
            title: '选择型组件',
            list: selectComponents
          },
          {
            title: '布局型组件',
            list: layoutComponents
          }
        ],
        dialogFormCopyRules: {
          name: [{
            required: true,
            message: '不可为空',
            trigger: 'blur'
          }],
          formRef: [{
            required: true,
            message: '不可为空',
            trigger: 'blur'
          }]
        }
      }
    },
    computed: {},
    watch: {
      // eslint-disable-next-line func-names
      'activeData.__config__.label': function(val, oldVal) {
        if (
          this.activeData.placeholder === undefined ||
          !this.activeData.__config__.tag ||
          oldActiveId !== this.activeId
        ) {
          return
        }
        this.activeData.placeholder = this.activeData.placeholder.replace(oldVal, '') + val
      },
      activeId: {
        handler(val) {
          oldActiveId = val
        },
        immediate: true
      },
      drawingList: {
        handler(val) {
          this.saveDrawingListDebounce(val)
          if (val.length === 0) this.idGlobal = 100
        },
        deep: true
      },
      idGlobal: {
        handler(val) {
          this.saveIdGlobalDebounce(val)
        },
        immediate: true
      }
    },
    mounted() {
      if (Array.isArray(drawingListInDB) && drawingListInDB.length > 0) {
        this.drawingList = drawingListInDB
      } else {
        this.drawingList = drawingDefalut
      }

      this.activeFormItem(this.drawingList[0])
      if (formConfInDB) {
        this.formConf = formConfInDB
      }

      if (opFormId) {
        this.getFormConfToDBDebounce(opFormId, res => {
          this.drawingList = res.fields
          for (const key in this.formConf) {
            this.formConf[key] = res[key]
          }

          // 预览
          if (opParams.op === 'run') {
            this.generateConf = {
              fileName: res.formRef,
              type: res.pageType
            }

            this.execRun()
          }

          // 拷贝
          else if (opParams.op === 'copy') {
            this.dialogFormCopyVisible = true
          }
        })
      }

      beautifier = require('js-beautify')

      const clipboard = new ClipboardJS('#copyNode', {
        text: trigger => {
          const codeStr = this.generateCode()
          this.$notify({
            title: '成功',
            message: '代码已复制到剪切板，可粘贴。',
            type: 'success'
          })
          return codeStr
        }
      })
      clipboard.on('error', e => {
        this.$message.error('代码复制失败')
      })
    },
    methods: {
      setObjectValueByStringKeys(obj, strKeys, val) {
        const arr = strKeys.split('.')
        arr.reduce((pre, item, i) => {
          if (arr.length === i + 1) {
            pre[item] = val
          } else if (Object.prototype.toString.call(pre[item]) !== '[Object Object]') {
            pre[item] = {}
          }
          return pre[item]
        }, obj)
      },
      setRespData(component, respData) {
        const {
          dataPath,
          renderKey,
          dataConsumer
        } = component.__config__
        if (!dataPath || !dataConsumer) return
        const data = dataPath.split('.').reduce((pre, item) => pre[item], respData)
        this.setObjectValueByStringKeys(component, dataConsumer, data)
        const i = this.drawingList.findIndex(item => item.__config__.renderKey === renderKey)
        if (i > -1) this.$set(this.drawingList, i, component)
      },
      fetchData(component) {
        const {
          dataType,
          method,
          url
        } = component.__config__
        if (dataType === 'dynamic' && method && url) {
          this.setLoading(component, true)
          this.$axios({
            method,
            url
          }).then(resp => {
            this.setLoading(component, false)
            this.setRespData(component, resp.data)
          })
        }
      },
      setLoading(component, val) {
        const {
          directives
        } = component
        if (Array.isArray(directives)) {
          const t = directives.find(d => d.name === 'loading')
          if (t) t.value = val
        }
      },
      activeFormItem(currentItem) {
        this.activeData = currentItem
        this.activeId = currentItem.__config__.formId
      },
      onEnd(obj) {
        if (obj.from !== obj.to) {
          this.fetchData(tempActiveData)
          this.activeData = tempActiveData
          this.activeId = this.idGlobal
        }
      },
      addComponent(item) {
        const clone = this.cloneComponent(item)
        this.fetchData(clone)
        this.drawingList.push(clone)
        this.activeFormItem(clone)
      },
      cloneComponent(origin) {
        const clone = deepClone(origin)
        const config = clone.__config__
        config.span = this.formConf.span // 生成代码时，会根据span做精简判断
        this.createIdAndKey(clone)
        clone.placeholder !== undefined && (clone.placeholder += config.label)
        tempActiveData = clone
        return tempActiveData
      },
      createIdAndKey(item) {
        const config = item.__config__
        config.formId = ++this.idGlobal
        config.renderKey = `${config.formId}${+new Date()}` // 改变renderKey后可以实现强制更新组件
        if (config.layout === 'colFormItem') {
          item.__vModel__ = `field${this.idGlobal}`
        } else if (config.layout === 'rowFormItem') {
          config.componentName = `row${this.idGlobal}`
          // !Array.isArray(config.children) && (config.children = [])
          delete config.label // rowFormItem无需配置label属性
        }
        if (Array.isArray(config.children)) {
          config.children = config.children.map(childItem => this.createIdAndKey(childItem))
        }
        return item
      },
      AssembleFormData() {
        this.formData = {
          fields: deepClone(this.drawingList),
          ...this.formConf
        }
      },
      generate(data) {
        const func = this[`exec${titleCase(this.operationType)}`]
        this.generateConf = data
        func && func(data)
      },
      // 运行
      execRun(data) {
        this.AssembleFormData()
        this.drawerVisible = true
      },
      // 下载
      execDownload(data) {
        const codeStr = this.generateCode()
        const blob = new Blob([codeStr], {
          type: 'text/plain;charset=utf-8'
        })
        saveAs(blob, data.fileName)
      },
      // 复制到剪切板
      execCopy(data) {
        document.getElementById('copyNode').click()
      },
      // 清空
      empty(tips = true) {
        if (tips) {
          this.$confirm('确定要清空所有组件吗？', '提示', {
            type: 'warning'
          }).then(
            () => {
              this.drawingList = []
              this.idGlobal = 100

              this.cleareFormConfDebounce()
              this.clearDrawingListDebounce()
            }
          )
        } else {
          this.drawingList = []
          this.idGlobal = 100

          this.cleareFormConfDebounce()
          this.clearDrawingListDebounce()
        }
      },
      drawingItemCopy(item, list) {
        let clone = deepClone(item)
        clone = this.createIdAndKey(clone)
        list.push(clone)
        this.activeFormItem(clone)
      },
      drawingItemDelete(index, list) {
        list.splice(index, 1)
        this.$nextTick(() => {
          const len = this.drawingList.length
          if (len) {
            this.activeFormItem(this.drawingList[len - 1])
          }
        })
      },
      generateCode() {
        const {
          type
        } = this.generateConf
        this.AssembleFormData()
        const script = vueScript(makeUpJs(this.formData, type))
        const html = vueTemplate(makeUpHtml(this.formData, type))
        const css = cssStyle(makeUpCss(this.formData))
        return beautifier.html(html + script + css, beautifierConf.html)
      },
      showJson() {
        this.AssembleFormData()
        this.jsonDrawerVisible = true
      },
      /**
       * 保存JSON数据,如果存在opFormId,则为更新已有数据
       */
      saveJson() {
        this.dialogFormCopyVisible = false

        this.AssembleFormData()
        if (opFormId && opParams.op !== 'copy') {
          this.updateFormConfToDBDebounce(opFormId, this.formData, success => {
            this.empty(false)
            this.$notify({
              title: '更新成功',
              message: '',
              type: 'success'
            })

            closeMe()
          }, err => {
            console.error(err)
            this.$notify({
              title: '更新失败',
              message: '',
              type: 'fail'
            })
          })
        } else {
          this.saveFormConfToDBDebounce(this.formData, success => {
            this.empty(false)
            this.$notify({
              title: '保存成功',
              message: '',
              type: 'success'
            })

            closeMe()
          }, err => {
            this.$notify({
              title: '保存失败',
              message: '',
              type: 'fail'
            })
          })
        }
      },
      download() {
        this.dialogVisible = true
        this.showFileName = true
        this.operationType = 'download'
      },
      run() {
        this.dialogVisible = true
        this.showFileName = false
        this.operationType = 'run'
      },
      copy() {
        this.dialogVisible = true
        this.showFileName = false
        this.operationType = 'copy'
      },
      tagChange(newTag) {
        newTag = this.cloneComponent(newTag)
        const config = newTag.__config__
        newTag.__vModel__ = this.activeData.__vModel__
        config.formId = this.activeId
        config.span = this.activeData.__config__.span
        this.activeData.__config__.tag = config.tag
        this.activeData.__config__.tagIcon = config.tagIcon
        this.activeData.__config__.document = config.document
        if (typeof this.activeData.__config__.defaultValue === typeof config.defaultValue) {
          config.defaultValue = this.activeData.__config__.defaultValue
        }
        Object.keys(newTag).forEach(key => {
          if (this.activeData[key] !== undefined) {
            newTag[key] = this.activeData[key]
          }
        })
        this.activeData = newTag
        this.updateDrawingList(newTag, this.drawingList)
      },
      updateDrawingList(newTag, list) {
        const index = list.findIndex(item => item.__config__.formId === this.activeId)
        if (index > -1) {
          list.splice(index, 1, newTag)
        } else {
          list.forEach(item => {
            if (Array.isArray(item.__config__.children)) this.updateDrawingList(newTag, item.__config__.children)
          })
        }
      },
      refreshJson(data) {
        this.drawingList = deepClone(data.fields)
        delete data.fields
        this.formConf = data
      }
    }
  }
</script>

<style lang='scss'>
  @import '@/styles/home';
</style>
